openEuler 20.03 LTS SP2 update for libass

1) Heap-based buffer overflow

EUVDB-ID: #VU56056

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-36430

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in decode_chars (called from decode_font and process_text). A remote attacker can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP2

libass-help: before 0.15.0-2

libass-devel: before 0.15.0-2

libass-debugsource: before 0.15.0-2

libass-debuginfo: before 0.15.0-2

libass: before 0.15.0-2

CPE2.3

• cpe:2.3:o:openeuler:openeuler:20.03:LTS SP2:*:*:*:*:*:*
• cpe:2.3:a:openeuler:libass-help:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libass-devel:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libass-debugsource:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libass-debuginfo:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:libass:*:*:*:*:*:openeuler:*:*

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1303

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.